Re: [boost] boost and 2007 US DST change

From: Jeff Garland (jeff_at_[hidden])
Date: 2007-01-10 16:41:55

Graham Bennett wrote:
> On Wed, Jan 10, 2007 at 08:19:57AM -0700, Jeff Garland wrote:
>> Graham Bennett wrote:
>>> Hi,
>>>
>>> I'm trying to evaluate whether some applications which use Boost are
>>> exposed to problems with the change to the start and end dates of
>>> Daylight Saving Time in the US this year
>>> (http://en.wikipedia.org/wiki/Energy_Policy_Act_of_2005#Change_to_daylight_saving_time).
>>>
>>> >From an initial inspection, it seems there are at least two areas which
>>> may cause incorrect behaviour after the change is made:
>>>
>>>  - There is a deprecated template class boost::date_time::us_dst_rules
>>>    (http://www.boost.org/boost/date_time/dst_rules.hpp) which hard-codes
>>> the rules for US DST changes.  Admittedly this class is deprecated, but
>>> it remains in the code base.
>> True -- it should be updated as I know there are some users.
> 
> Ok, I'll have a go at making a patch.

Great, thx!

>>>  - Boost ships with a database of timezone and DST information in CSV
>>>    format.  This appears to contain the old dates for the DST changeover
>>> as reported here
>>> http://sourceforge.net/tracker/index.php?func=detail&aid=1478619&group_id=7586&atid=207586.
>>>
>>> Does the above seem right?  Also, have these problems been fixed in the
>>> upcoming 1.34 release?  From a quick scan of CVS it seems not.
>> Nope, see other recent post on this topic.
>>
>>> I'd also be grateful if people could comment on any other areas within
>>> Boost that could be problematic, if any.
>>>
>>> Lastly I wonder if it's worth perhaps summarising this on the Boost site
>>> somewhere so that it's easier for others to find the information.
>> It should probably go in the date-time docs and the 1.34 release notes -- care 
>> to write a summary blurb?
> 
> I'll try to send this along with the patch.

Ditto -- although just a text writeup will probably do as I'll integrate it 
with the docs.

Jeff